Vibration device and imaging device

Abstract

A vibration device includes a light-transmissive cover, a piezoelectric element to vibrate the light-transmissive cover, at least one vibration body connected to the piezoelectric element, at least one power feed conductor in contact with the piezoelectric element and feeding power to the piezoelectric element, and at least one elastic portion to press the at least one power feed conductor against the piezoelectric element.

What is claimed is: 
     
       1. A vibration device comprising:
 a light-transmissive cover; 
 a piezoelectric element to vibrate the light-transmissive cover; 
 at least one vibration body connected to the piezoelectric element; 
 at least one power feed conductor in contact with the piezoelectric element and feeding power to the piezoelectric element; and 
 at least one elastic portion pressing the at least one power feed conductor to the piezoelectric element; wherein 
 the at least one elastic portion is provided by bending the at least one power feed conductor, and has a plate spring shape provided by curving the at least one power feed conductor. 
 
     
     
       2. The vibration device according to  claim 1 , wherein a contact region of the at least one power feed conductor and the piezoelectric element is smaller than a connection region of the at least one vibration body and the piezoelectric element. 
     
     
       3. The vibration device according to  claim 2 , wherein
 the piezoelectric element includes a first surface and a second surface on a side opposite to the first surface; 
 the vibration body is connected to the light-transmissive cover and the first surface of the piezoelectric element; 
 the power feed conductor is in contact with the first surface of the piezoelectric element; 
 the at least one elastic portion presses the power feed conductor against the first surface of the piezoelectric element; and 
 in the first surface of the piezoelectric element:
 an occupation ratio of the connection region is about 70% or more; and 
 an occupation ratio of the contact region is about 30% or less. 
 
 
     
     
       4. The vibration device according to  claim 1 , wherein
 the at least one power feed conductor includes an annular portion; 
 the at least one elastic portion includes a plurality of elastic portions; and 
 the plurality of elastic portions are disposed at equal or substantially equal intervals in the annular portion. 
 
     
     
       5. The vibration device according to  claim 1 , wherein
 the at least one vibration body is made of metal; and 
 the at least one vibration body is covered with an insulation material. 
 
     
     
       6. An imaging device comprising:
 the vibration device according to  claim 1 ; and 
 an imaging element in the vibration device. 
 
     
     
       7. The imaging device according to  claim 6 , wherein a contact region of the at least one power feed conductor and the piezoelectric element is smaller than a connection region of the at least one vibration body and the piezoelectric element. 
     
     
       8. The imaging device according to  claim 7 , wherein
 the piezoelectric element includes a first surface and a second surface on a side opposite to the first surface; 
 the vibration body is connected to the light-transmissive cover and the first surface of the piezoelectric element; 
 the power feed conductor is in contact with the first surface of the piezoelectric element; 
 the at least one elastic portion presses the power feed conductor against the first surface of the piezoelectric element; and 
 in the first surface of the piezoelectric element:
 an occupation ratio of the connection region is about 70% or more; and 
 an occupation ratio of the contact region is about 30% or less. 
 
 
     
     
       9. The imaging device according to  claim 6 , wherein
 the piezoelectric element includes at least one electrode; 
 the at least one vibration body includes at least one groove to expose the at least one electrode; and 
 the at least one elastic portion is disposed in the at least one groove. 
 
     
     
       10. A vibration device comprising:
 a light-transmissive cover; 
 a piezoelectric element to vibrate the light-transmissive cover; 
 at least one vibration body connected to the piezoelectric element; 
 at least one power feed conductor in contact with the piezoelectric element and feeding power to the piezoelectric element; and 
 at least one elastic portion pressing the at least one power feed conductor to the piezoelectric element; wherein 
 the piezoelectric element includes at least one electrode; 
 the at least one vibration body includes at least one groove to expose the at least one electrode; and 
 the at least one elastic portion is disposed in the at least one groove. 
 
     
     
       11. A vibration device comprising:
 a light-transmissive cover; 
 a piezoelectric element to vibrate the light-transmissive cover; 
 at least one vibration body connected to the piezoelectric element; 
 at least one power feed conductor in contact with the piezoelectric element and feeding power to the piezoelectric element; and 
 at least one elastic portion pressing the at least one power feed conductor to the piezoelectric element; wherein 
 the piezoelectric element includes a first surface and a second surface on a side opposite to the first surface; 
 the at least one power feed conductor includes a plurality of power feed conductors; 
 the at least one elastic portion includes a plurality of elastic portions; 
 the plurality of power feed conductors include a first power feed conductor in contact with the first surface and a second power feed conductor in contact with the second surface; and 
 the plurality of elastic portions include at least one first elastic portion to press the first power feed conductor to the first surface and at least one second elastic portion to press the second power feed conductor to the second surface. 
 
     
     
       12. The vibration device according to  claim 11 , wherein
 the piezoelectric element has an annular shape; 
 the at least one vibration body includes a plurality of vibration bodies; 
 the plurality of vibration bodies include a first vibration body connected to a bottom surface of the light-transmissive cover and the first surface of the piezoelectric element and a second vibration body connected to the second surface of the piezoelectric element; and 
 the second power feed conductor is in contact with the piezoelectric element on an inner peripheral side of the piezoelectric element relative to the first power feed conductor. 
 
     
     
       13. The vibration device according to  claim 12 , wherein
 in the first surface of the piezoelectric element, a contact region of the first power feed conductor and the piezoelectric element is smaller than a connection region of the first vibration body and the piezoelectric element; and 
 in the second surface of the piezoelectric element, a contact region of the second power feed conductor and the piezoelectric element is smaller than a connection region of the second vibration body and the piezoelectric element. 
 
     
     
       14. The vibration device according to  claim 12 , wherein
 the piezoelectric element includes a first electrode provided on the first surface and a second electrode provided on the second surface; 
 the first vibration body includes at least one first groove to expose the first electrode; 
 the second vibration body includes at least one second groove to expose the second electrode; 
 the at least one first elastic portion is disposed in the at least one first groove; and 
 the at least one second elastic portion is disposed in the at least one second groove. 
 
     
     
       15. The vibration device according to  claim 14 , wherein the first power feed conductor includes at least one first support portion extending in a direction intersecting a thickness direction of the piezoelectric element, and the piezoelectric element is held between the at least one first elastic portion and the at least one first support portion. 
     
     
       16. The vibration device according to  claim 14 , wherein the second power feed conductor includes at least one second support portion extending in a direction intersecting a thickness direction of the piezoelectric element, and the piezoelectric element is held between the at least one second elastic portion and the at least one second support portion. 
     
     
       17. The vibration device according to  claim 11 , wherein
 the at least one first elastic portion include a plurality of first elastic portions; 
 the at least one second elastic portion include a plurality of second elastic portions; and 
 the plurality of second elastic portions are disposed between the plurality of first elastic portions. 
 
     
     
       18. The vibration device according to  claim 11 , wherein the at least one first elastic portion and the at least one second elastic portion are opposed to each other in a thickness direction of the piezoelectric element.